| Feature
extraction |
| “Rectangular”
filters |
|
|
| Feature output is difference |
|
| between
adjacent regions |
|
|
|
|
|
| Value at (x,y) is |
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| sum of pixels |
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| above and to the |
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| left
of (x,y) |
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|
|
|
|
|
|
|
| Efficiently computable |
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| with integral image: any |
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| sum can be computed |
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| in constant time |
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| Avoid scaling images |
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| scale features directly |
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| for
same cost |
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| Integral
image |
| Viola
& Jones, CVPR 2001 |
| 50 |
| K. Grauman, B. Leibe |